Question

一个非常简单/困难的问题。我需要下载哪些软件包才能创建一个带有EGL / OpenGLES上下文的简单X11窗口。正如我今天所知，dri2无法进行身份验证。但它不能是我链接到错误的库，否则它不会接受eglGetDisplay的X11窗口。

我真的不想使用任何像glfw或sdl这样的库（包装器包装）。
我使用raspbian stretch和默认的完整KMS（VMWare驱动程序）。

我的代码（如果有关系）：

#include <X11/Xlib.h>
#include <EGL/egl.h>
#include <EGL/eglplatform.h>
#include <GLES2/gl2.h>
#include <iostream>

struct Pane {
    Window win;
    Display *display;
    Atom windowDeletMessage;
    int x11_file;

    EGLDisplay egl_display;
    EGLContext egl_context;
    EGLSurface egl_surface;
    EGLConfig  egl_config;
    EGLint     egl_num_config;

    EGLint egl_minor;
    EGLint egl_major;
};

void setup_window(Pane &self) {

    self.display = XOpenDisplay(nullptr);
    if (self.display == nullptr) {
        exit(0);
    }

    auto s = DefaultScreen(self.display);
    self.win = XCreateSimpleWindow(self.display,
                                   RootWindow(self.display, s),
                                   10,
                                   10,
                                   800,
                                   600,
                                   1,
                                   BlackPixel(self.display, s),
                                   WhitePixel(self.display, s));

    self.windowDeletMessage = XInternAtom(self.display, "WM_DELETE_WINDOW", false);
    XSetWMProtocols(self.display, self.win, &self.windowDeletMessage, 1);

    XStoreName(self.display, self.win, "Default Window");

    XSelectInput(self.display,self.win, KeyPressMask | KeyReleaseMask | LeaveWindowMask | EnterWindowMask | PointerMotionMask | ResizeRedirectMask);

    XMapWindow(self.display, self.win);
    XFlush(self.display);

    self.x11_file = ConnectionNumber(self.display);
}

void GetEvent(Pane &self, XEvent &e) {
    // Event handling...
}

void setup_egl(Pane &self)
{
    const EGLint Attributes[] = //Note to much is to much
    {
            EGL_RED_SIZE,8,
            EGL_GREEN_SIZE,8,
            EGL_BLUE_SIZE,8,
            EGL_ALPHA_SIZE,8,
            EGL_NONE,
    };

    self.egl_display = eglGetDisplay(self.display);
    if(self.egl_display == EGL_NO_DISPLAY)
    {
        printf("EGL Failed to Obtain Window!")  // Note this is not Error handling!
               exit(103);
    }
    if(eglInitialize(self.egl_display,&self.egl_major,&self.egl_minor) == EGL_FALSE)
    {
        printf("EGL Failed to Initzialize!""");
        exit(104);
    };

    eglChooseConfig(self.egl_display, Attributes, &self.egl_config, 1, &self.egl_num_config);
    self.egl_context = eglCreateContext(self.egl_display, self.egl_config,EGL_NO_CONTEXT,nullptr);
    self.egl_surface = eglCreateWindowSurface(self.egl_display, self.egl_config, self.win, nullptr);
    eglMakeCurrent(self.egl_display, self.egl_surface, self.egl_surface, self.egl_context);

    glClearColor(1.0f, 1.0f, 1.0f, 1.0f);
    glClear(GL_COLOR_BUFFER_BIT);
    glFlush();
    eglSwapBuffers(self.display, self.egl_surface);
}

int main(int argc, char **argv) {
    Pane pane;
    setup_window(pane);
    setup_egl(pane);

    XEvent e;
    while (true) {
        GetEvent(pane, e);
        glClear(GL_COLOR_BUFFER_BIT);
    }
}

<小时/> 修改

因为我使用的是USB驱动器而不是SD卡。因此raspi-config无法访问SD卡上的配置文件，因此无法启用完整的KMS。

Raspberry Pi OGLES设置

0 个答案: